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Note 11 - Accrued Expenses (Details Textual) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Management Incentive Plans [Member] |  |
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $ 214,000 | $ 214,000

X
- Definition Amount of commitment made to pay deferred cash remuneration. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualCashAwardGrantedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_PlanNameAxis=pesi_ManagementIncentivePlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |